99.Which of the following most logically completes the argument?
The irradiation of food kills bacteria and thus retards spoilage. However, it also lowers the nutritional value of many foods. For example, irradiation destroys a signifi cant percentage of whatever vitamin B1 a food may contain. Proponents of irradiation point out that irradiation is no worse in this respect than cooking. However, this fact is either beside the point, since much irradiated food is eaten raw, or else misleading, since
(A) many of the proponents of irradiation are food distributors who gain from foods’ having a longer shelf life
(B) it is clear that killing bacteria that may be present on food is not the only effect that irradiation has
(C) cooking is usually the fi nal step in preparing food for consumption, whereas irradiation serves to ensure a longer shelf life for perishable foods
(D) certain kinds of cooking are, in fact, even more destructive of vitamin B1 than carefully controlled irradiation is
(E) for food that is both irradiated and cooked, the reduction of vitamin B1 associated with either process individually is compounded
那么如果按照逻辑上来说,应该一个能够否定proponent所提出的这种比较,也就是要达到irradiation worse than cooking的选项。
那么E选项说的是,那些“既irradiation,又cooking” 的食物,比irradiation或者cooking两者任何之一的破坏都要大,那么简单的一个不等式关系就是:irradiation+cooking>irradiation or cooking,这个关系,只能说明irradiation和cooking都有破坏作用,但是不意味着“irradiation<=cooking,即proponent所说的no worse than cooking。”能够被驳斥。
or else前面说 irradiate的food基本是不会去cook的。 后面用else转折,如果both cook and irradiate,那么减少b的效果就被compound了,这时我们就无法比较到底哪些是由于cook而减少的,哪些是由于irradiate减少的。 这题要我们证明proponent这句话是无根据的,而不是要我们证明这句话是错的。
总结一下以上的观点,能够选出正确答案E的有两种方法: 1,ABC选项是无关结论的,D削弱结论(因为支持了porpenents的观点,即cooking is worse than irradiation),所以选E。 2,逻辑思路上:作者的反驳基于,两点: 一,比较是beside the point,因为大部分irradiation food是生吃;隐含义:所以irradiation和cooking不能比较 二,这样的比较是misleading,因为“?”;E选项:如果both cook and irradiate,那么减少B1的效果就被compound了,这时我们就无法比较到底哪些是由于cook而减少的,哪些是由于irradiate减少的。 这题要我们证明proponent这句话是无根据的,而不是要我们证明这句话是错的。
要反驳proponants的观点 答案就要指出cooking《irradiation即 i is worse in this respect than c 选项C只说了i的用途 就算它们最终要COOK 选项C也没有说COOK后 到底B1的含量是多少 可能这个量是 c>i 也可能是c<i 我觉得哈...